Clams can be eaten if they can move by touching tentacles overnight, but they can't eat if they can't move by touching tentacles. Because the clam whose tentacles don't move shows that it is dead, it will breed a lot of bacteria, which is not good for your health. The bought live clams can be stored in a low temperature place or a refrigerator, so that they are not easy to die.

The clam shell is 2.5-5.7 cm long, solid, with equal petals and unequal sides, slightly oval; The color and pattern of the shell surface change greatly, and the appearance is generally cream, brown and dark brown, with stripes or spots and patterns composed of dense brown or reddish brown; The inside of the shell is white, pink, light gray or flesh red. Meretrix meretrix has the advantages of fast growth, short culture cycle, strong adaptability and long survival time out of water. It is an excellent shellfish suitable for artificial high-density culture.